1097971489 has 4 divisors (see below), whose sum is σ = 1098824580. Its totient is φ = 1097118400.

The previous prime is 1097971471. The next prime is 1097971507. The reversal of 1097971489 is 9841797901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9841797901 = 13 ⋅757061377.

It is an interprime number because it is at equal distance from previous prime (1097971471) and next prime (1097971507).

It can be written as a sum of positive squares in 2 ways, for example, as 896104225 + 201867264 = 29935^2 + 14208^2 .

It is a cyclic number.

It is not a de Polignac number, because 1097971489 - 2¹¹ = 1097969441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097971409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424612 + ... + 427189.

It is an arithmetic number, because the mean of its divisors is an integer number (274706145).

Almost surely, 2^1097971489 is an apocalyptic number.

It is an amenable number.

1097971489 is a deficient number, since it is larger than the sum of its proper divisors (853091).

1097971489 is an equidigital number, since it uses as much as digits as its factorization.

1097971489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853090.

The product of its (nonzero) digits is 1143072, while the sum is 55.

The square root of 1097971489 is about 33135.6528379931. The cubic root of 1097971489 is about 1031.6451821028.

The spelling of 1097971489 in words is "one billion, ninety-seven million, nine hundred seventy-one thousand, four hundred eighty-nine".